Calling a server side function from client side using the toolkit

Ok, I'm sure this is a really stupid question, but I'm willing to ask it anyway.

Let's say that I created a new extender called "My", so I now have three files files, MyExtender.cs, MyBehaviour.js, and MyDesigner.cs.

I want my control to be able to take some data on the client side and use it to retrieve some data on the server side, which AJAX is all about right? :) So for the sake of argument, let's say I want to enter an email address in a textbox, and then consult a database to return the user's password.

So in my MyExtender.cs file, I create a function something like this:

public string getPassword(string email) {

... Make some database calls to get the info

return password;

}

What code do I put into the MyBehaviour.js file in to to call the getPassword function? And do I need any special decorations on the getPassword() function to make it happen?

You can use ICallbackEventHandler interface for this purpose. This is the exact purpose of this interface in ASP.Net 2.0. Check out the MSDN for this interface.

You really should look at how to create an extender to do it the best way. There is a great tutorial here,http://www.asp.net/ajax/ajaxcontroltoolkit/samples/Walkthrough/CreatingNewExtender.aspx that is a simple example of how to create a simple extender. Also if you just want to use the code behind to retrieve info from the database, you may just want to wrap an update panel around your form and get the data from the code behind. Either way you will be able to accomplish what you want.